Method for controlling machine room air conditioner based on variable frequency compressor

Abstract

The invention relates to a method for controlling a machine room air conditioner based on a variable frequency compressor. The method comprises the following steps of: 1, initializing the machine room air conditioner, and returning an electronic expansion valve to zero; 2, starting an evaporator, and regulating the air velocity of a fan of the evaporator according to air suction pressure Ps; 3, starting the variable frequency compressor, and regulating the frequency H of the variable frequency compressor according to the indoor temperature T0 and the preset temperature TA; 4, starting a condenser in time T2 after the variable frequency compressor is started, and controlling the air velocity of a fan of the condenser according to exhaust pressure PD and the air inlet temperature TD; and 5, controlling the opening Pm of the electronic expansion valve, and performing corresponding compensation on the opening Pm of the electronic expansion valve according to the frequency of the variable frequency compressor. By adopting the method for controlling the machine room air conditioner based on the variable frequency compressor, the temperature is controlled more stably and the fluctuation is low; and the opening of the expansion valve is compensated through the variable frequency compressor, so that the superheat degree is more stable and close to the expected target value.

Description

technical field [0001] The invention relates to a refrigeration system, and more specifically, to a method for controlling an air conditioner in a computer room based on a variable frequency compressor. Background technique [0002] Computer room precision air conditioner is a special air conditioner designed for modern electronic equipment room. Its working accuracy and reliability are much higher than ordinary air conditioners. Computer equipment and program-controlled switch products are placed in the computer room, which is composed of a large number of dense electronic components. To improve the stability and reliability of these devices, it is necessary to strictly control the temperature and humidity of the environment within a specific range. [0003] The special air conditioner for the machine room is designed to strictly control the evaporation pressure in the evaporator, increase the air supply volume so that the surface temperature of the evaporator is higher th...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the temperature adjustment of the fixed-frequency air conditioner in the prior art is likely to cause the room temperature to be hot and cold, and consume more electric energy, and rely solely on the degree of superheat to control the opening of the electronic expansion valve, so that the overheating of the system Due to the relatively lagging defect of heat control, a computer room air-conditioning control method based on an inverter compressor can be provided to solve the above problems

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